lost virginity. period late. Help.

Riley • This is the best app ever.
So I lost my virginity to my boyfriend on may 7. And we did not use a condom (don't judge, we didn't have one handy) but he did not cum in me. I normally get my period around the end of the month but I'm 7 days late and I'm worried I might be pregnant. My period is normally like clockwork. Always at the end of the month, I've never been late before. 
Any advice/ need some reasurenece